Twine-cutter.



F. J. THULL.

TWINE GUTTER.

APPLIOATION FILED MAY 11,*19124.

1,087,471 Ptentea Feb.17,1914.

"nnrrnn sfr-Arne earner ormoni.

FRANK .T. THULL, OF MINNEAPOLIS, MINNESOTA.

TWINE-CUTTER.

specication of Letters Patent.

Application filed May 11, 1912.

Patented Feb. 1'?, 1914i.

serial No. 696,714.

to the stitching mechanism to enable the operator of the. machine to easily and quickly7 cut the twine when the bag has been sewed.

il. further object is to provide a twine cutting device of simple construction and one which can-be easily and quickly'applied to the machine.

My invention consists generally in various constructionsand combinations, all as hercinafter vdescribed and particularly pointed out in the claims.

ln the accompanying drawings forming part of this specification, Figure 1 is a side view, partially in section, of a portion of a.. bug sewing machinewith my inventionap plied thereto, Fig. 2 is a detail view of the twine cutting knife, showing the movable and stationary jaws.- Fig. 3 is a similar view, lool-:ing at the other side of the knife, Fig. 'i is a. top' view, partially in section,

1ating the means for securing the device to tiri-B macliine trame.

in the di wing, il represents the frame ci the machine having a l'dowmvar'dly ext f arm or llfiraclret 8 in which the smelling mechanism, which l have not thought necessary to illustrate in detail herein, is mounted. l is a hanger., between which'and .the lower portion of the arm 3 the yfolded-fl end of the sack 5 is fed. During thisuieeding operation the open end of the L .1 f I saca is stitched and closed.

Twine -cutting devices lJi-various kinds have been provided, but all ci them have proved more or less unsatistaetory on account of their number of'parts, the time required for adjnstmcnt'and the location oi the knife, which frequently is located a considerable distance from the stitching mech anism where it cannot be conveniently reached by the operator. 1

6 is e block secured-to the henger 4 by screws 7 or other suitable means, and having a hole 8 near one end and a slot 9 coinmunicating with said hole, forming jaws: 10 which are clamped on a screw 11 bymeans oi. u clamping screw 12.

13 is a stationary plate mountedon the I block 6 by any suitable means, preferably pins 14, and provided at one end with. a V- shaped recess forming stationary jaws 15.

having cutting edges 16. 17 is an L-shaped plate having cutting edges 18 at one end and pivoted at the intersectionv of its arms on the screw 11. The plate 17 is adapted to bear on the plate 13 and the cutting edges 18 converge toward one another and sweep across the V-shaped opening in the stationary plate cooperating with the cutting edges thereof to sever the twine or cord inserted between them. By loosening the clamping 'screw 12 the screw lllmay be withdrawn and the plate 17 adjusted toward or from the stationary plate 13. When the desired adjustment of the screw 11 is obtained the clamping screw 12 is tightened to clamp the jaws 10 on the screw 11 and prevent it from becoming accidentally loosened..

The plate 17 oscillates continuously with the movement of the machine, and for the purpose of operating` it I provide a. pitmanrod 19 attached at 2O to one arm of the plate 17 and reciprocated by an eccentric 21 on aV shaft 22. The reciprocation. of the rod 19 will swing the plate 17 and its cutting edges past the stationary cutting,r edges of the plate 13 and the location of the cutting edges close to the stitched portion of the sack will enable the operator, as soon as the stitching operation is completed., to slip the thread between the jaws where it will be easily and quickly severed by the movement ot the plate 17.

it will he noted in Figs. 2 and 3 that the .cutting edges of tne stationary and movable knives converge in opposite directions so that when a thread or twine is inserted between the knives a drawing or shearing cut will. he obtained and the twine will be in'- stantly and completely severed.

l claim es my invention 1. A thread cutting device comprising a block having a socket therein, a screw fitting within said socket, said block having clamping jaws to grip said screw, a stationary knife mounted on said block and provided with cutting edges, a movable knife mounted on seid screw and having cutting edges adapted to sweep past the ric mechanism and having a V-shaped recess' therein provided with cutting edges, a movable knife having tape'red cutting edges adapted to swing past the cutting edges of said' stationary knife, a shaft, an eccentric thereon, and a pitman-rod connecting said eccentric with said movable knife.

8. The combination, with a stitching :machine having a vertically arranged hanger, of a stationary knife secured horizontally to the lower portion of said hanger and pro vided with a cutting edge, a pivoted knife also supported by said hanger in a substantially horizontal position and having a cutting edge adapted to sweep by the cutting edge of said stationary knife, a horizontal shaft in the rear of 'said hanger, an eccenf tricthereon, andv a pitman extending forward horizontally from said eccentric and Loenen connected with said pivoted knife to move the same in a substantially vertical plane.

4. The combination, with a stitching machine, of a block secured thereon, a plate mounted on said block and provided with cutting edges and forming a stationary knife, an oscillating knife having cutting edges adapted to sweep by the'cutting edges of said stationary knife, a screw passing through said oscillating knife and said plate vand into4 a socket in said block and clamping jaws to grip said screw, and a clamping screw for said jaws, the loosening of said clamping screw allowing the adjustment of said screw and the movement of said oscillating knife towardor from said stationary knife, and means for operating said Oscillating knife.

In witness whereof, I have hereunto set my hand this '7th day of May, 1912.

' FRANK J. THULL. lVitnesses GENEVIEVE E. SORENSEN, EDWARD A. PAUL. 

